Aircraft: COMMERCIAL FIXED WING
Phase of flight: Parked
Anomaly: No Specific Anomaly Occurred All Types

Initial pairing was brought to my attention the night prior. After reviewing the assignment and forecast winter weather for the following day; an earlier commute was needed to deal with icing conditions. Having left my residence at XA00 for an XD00 hours show; I encountered winter weather driving condition along with a longer commute. Arriving at ZZZ by XD00 hours I noticed the first delay with the flight being pushed until XF00 hours.The Captain and I boarded the aircraft a little after XG00 hours. While entering the forward galley we observed a pool of liquid coming out of the right oven. Maintenance and catering were both notified and a fix was attempted. At approximately XH00 hours maintenance began a series of unusual activity. Running both engines at the gate as well as removing equipment from the cabin. This was our first indication that the aircraft was not ready for ferry. During this time we were in communication with dispatch and Maintenance Control trying to secure a Maintenance Ferry Document. At approximately XI:40 we were advised the departure was being pushed until XN:30 hours for deep cleaning. The Captain and I walked over to the hotel for lunch and received a room at approximately XJ00 hours. Agreeing to meet in the lobby at XL:30 hours for our new departure; a nap was not taken as we continued to try and track down hotel accommodations for later that night; get information for a point of contact in ZZZ1 and confirm transportation for travel to ZZZ2.At XL:45 hours we were advised of a new departure time of XO:30 as the plane was still not ready for ferry; due to maintenance sign off and Ferry Documentation. By XO:45 the Captain was at his decision point as a disagreement between Dispatch and Maintenance Control had developed preventing the Ferry Documentation being provided for a legal departure. At approximately XP00 hours I reviewed my own fitness and determined I was still at least 2 hours from departure and dealing with winter weather and maintenance. I felt I would not be able to get suitable sleep until approximately XV00 hours and this was pushing the limits to my own fitness in dealing with the threats of flying late at night; icing/weather challenges and the threat of fearing and aircraft vs. normal line operations. It was then that I decided a fatigue call would be the safest course of action. Everyone is stressed out by the Coronavirus Crisis. The Maintenance Controller was working from home and might not have been able to generate a maintenance ferry document from home. He finally generated one. The aircraft had been parked for over 3 weeks; probably without adequate prep for that length of time which probably caused the leaks under the ovens. ZZZ Maintenance is overworked and understaffed to properly prepare multiple aircraft (that had been parked for weeks) at short notice and with new aircraft disinfecting processes just established. Unfortunately; I won't let ZZZ Maintenance; Maintenance; Dispatch and the Operations Manager make decisions that result in an unsafe flight or an unsafe operation; especially when I've been up for over 14 hours and I've got another 4 hours to go and fly into my Window of Circadian Low (WOCL). The aircraft was successfully flown with that maintenance ferry document from ZZZ to ZZZ1 the next morning. Air carrier flight crew reported many delays encountered to get a flight going that eventually departed the next day.